JpGU-AGU Joint Meeting 2017

講演情報

[JJ]Eveningポスター発表

セッション記号 O (パブリック) » パブリック

[O-04] [JJ] キッチン地球科学 -手を動かすことの利点-

2017年5月20日(土) 17:15 〜 18:30 ポスター会場 (国際展示場 7ホール)

[O04-P03] 「ペレーの毛」の形成に関する流れの可視化実験

山田 美幸1村井 祐一2、*熊谷 一郎2,3 (1.日本大学、2.北海道大学、3.明星大学)

キーワード:火山、実験、粘性流体

In the session of the kitchen Earth Science last year, we presented an analog experiment on “Pele’s hair” which could be observed in the volcanic products in Hawaii Islands. We’d succeeded in producing similar texture of “Pele’s hair” by using a cotton candy machine we had invented, and showed that the texture of the sugar fibers (e.g. their thickness and length) depends on several important parameters such as rheological properties of the melted sugar, initial temperature at the outlet of the melted sugar jet, and its ejection speed. Recently we have conducted flow visualization regarding this analog experiment to understand the flow behavior around the melted sugar jet. The experimental setup for flow visualization consists of the cotton candy machine, commercial humidifiers for the flow tracers, and a LCD projector to generate multi-color light sheets. The flow behavior was recorded by a high-speed video camera; the eddies and vortices were clearly observed around the rotating dishes, which affect the formation process of the analog “Pele’s hair”. We also examined effect of the following parameters such as the rotating speed, heating temperature, diameter of the outlets, which cause a variation in the texture of the cotton candy as reported the last presentation.